For Maria Cisneros, there’s no better sound than her brother Derek’s heartbeat.

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"I will just miss him completely," Cisneros said. "I thank God for him being my brother, for first of all being my baby."

When Derek died in a car crash when he was 12, his family was given a Heartprints pillow. The pillow comes with a recording of Derek’s heartbeat inside.

The Cisneros family was one of the first families to receive a pillow from the Iowa Donor Network.

"We feel the heartbeat really symbolizes the life and memories that this one person has lived, but also the legacy they are about to leave in somebody else as well," Kaylie Hoyle, of the Iowa Donor Network, said.

The program has since grown, with over 100 families receiving one of the handmade pillows.